My Player 3 display stopped working on my Skateball. It stays black or shows all 1's when game is powered on. Same in display test, stays blank or shows all 1's while all other displays cycle through all the numbers correctly. I disconnected the J1 connector from the player 3 display and changed it with one of the other working displays. The working display works fine in the player three position, but the non-working display does not work in the one I swapped it with which makes me believe the problem is either on the player 3 display board or the display glass. I have good voltages 5 volts and 170 volts on the player 3 display board test points. I have read thru Clays manual as well as Pinwiki's discussion on the Bally SS displays, but nothing there helps me pinpoint my issue or what to check next. Any suggestions on what to check next? This is my first Bally SS so I am on a bit of a learning curve. I was thinking decoder chip, but i hate to just shotgun replace stuff. I did order a new glass from PBR so I might try testing it with the board by touching the pins as Clay suggests..
Thanks

Morning bump. Any other thoughts from the Bally SS folks?

Ok. I socket and put in a new Decoder IC chip and report results. I do have a logic probe. Just not quite sure how to use the LP to test the chip in this instance.

Put a machine pin socket in and installed a new decoder chip. Display works perfect now. Thanks for the help everyone.